Question: 5 x _ ( 1 ) + x _ ( 2 ) + 2 s _ ( 2 ) = 2 0 - 4 x

5x_(1)+x_(2)+2s_(2)=20
-4x_(2)+s_(1)+4s_(2)=16
-4x_(2)-2s_(2)+p=21 solve for x-1

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